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Co-leader Jonathan Bartley, pictured, is joined by Steven Agnew and Keith Taylor from the party [Image: Sarah Lee for the Guardian].

The question of whether it is possible to revoke the decision to trigger article 50 of the Lisbon treaty, which will formally begin the UK’s withdrawal from the European Union, has become more urgent now that Theresa May has confirmed that parliament will be given a second vote on the final shape of any Brexit deal.

The legal challenge seeks a referral to the [European] Court of Justice on the question of whether article 50, once triggered, can be unilaterally revoked by the UK government without requiring consent from all other 27 EU member states. The Luxembourg court is the ultimate judicial authority on EU law.